Вопрос:

1) \(\frac{3}{4}+\frac{2}{3}\); 2) \(1\frac{1}{4}-\frac{2}{3}\); 3) \(\frac{1}{6}+\frac{2}{3}\); 4) \(1\frac{7}{12}-\frac{3}{4}\); 5) \(\frac{5}{12}+\frac{3}{4}\); 6) \(1\frac{11}{12}-\frac{2}{3}\). Пользуясь числовым лучом, найдите сумму и разность дробей.

Ответ:

  1. \(\frac{3}{4}+\frac{2}{3}=\frac{9}{12}+\frac{8}{12}=\frac{17}{12}=1\frac{5}{12}\).
  2. \(1\frac{1}{4}-\frac{2}{3}=\frac{5}{4}-\frac{2}{3}=\frac{15}{12}-\frac{8}{12}=\frac{7}{12}\).
  3. \(\frac{1}{6}+\frac{2}{3}=\frac{1}{6}+\frac{4}{6}=\frac{5}{6}\).
  4. \(1\frac{7}{12}-\frac{3}{4}=1\frac{7}{12}-\frac{9}{12}=1\frac{-2}{12}=\frac{10}{12}=\frac{5}{6}\).
  5. \(\frac{5}{12}+\frac{3}{4}=\frac{5}{12}+\frac{9}{12}=\frac{14}{12}=1\frac{1}{6}\).
  6. \(1\frac{11}{12}-\frac{2}{3}=1\frac{11}{12}-\frac{8}{12}=1\frac{3}{12}=1\frac{1}{4}\).

Ответ: 1) \(1\frac{5}{12}\); 2) \(\frac{7}{12}\); 3) \(\frac{5}{6}\); 4) \(\frac{5}{6}\); 5) \(1\frac{1}{6}\); 6) \(1\frac{1}{4}\).